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Erasable electrophotographic toner containing organic white pigment and method of producing the same

a technology of electrophotographic toner and organic white pigment, which is applied in the direction of optics, instruments, developers, etc., can solve the problems of affecting the recycling of paper, affecting the visibility of printed information, and unable to recognize pre-erasable printed information, etc., to achieve the effect of improving visibility and difficultness

Inactive Publication Date: 2013-05-16
CASIO ELECTRONICS MFG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention aims to provide an erasable electrophotographic toner that can improve visibility after erasing and make it difficult to identify and restore pre-erasing printed information. The method for producing this toner is also provided.

Problems solved by technology

However, conventional photosensitive toners had a defect that the pre-erasing printed information can be recognized after erasing since the erasing is insufficient, and thus a shade remains or yellowing occurs after erasing.
In such cases, recycling of paper may be interfered, or the pre-erasing information may be restored easily to cause leakage of information.

Method used

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  • Erasable electrophotographic toner containing organic white pigment and method of producing the same
  • Erasable electrophotographic toner containing organic white pigment and method of producing the same
  • Erasable electrophotographic toner containing organic white pigment and method of producing the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0039]The photosensitive toner was prepared as follows.

[0040]A raw material consisting of 1.5 parts by mass of infrared photosensitive dye “IRT” having sensitivity at a wavelength of 817 nm (manufactured by Showa Denko K. K.), 7.5 parts by mass of organic boron compound decolorizing agent “P3B” (manufactured by Showa Denko K. K.), 82.0 parts by mass of a polyester binder resin for toners (manufactured by Kao Corp.), 1.5 parts by mass of negative electrical charge controlling agent “LR-147” (manufactured by Japan Carlit Co., Ltd.), 2.5 parts by mass of Carnauba Wax No. 1 powder (imported by S. Kato & Co.) and 5.0 parts by mass of organic white pigment “Shigenox F” (manufactured by Hakkol Chemical Co., Ltd.) was put into a Henschel mixer (manufactured by Mitsui Mining Company, Ltd.) and mixed.

[0041]Then, the mixture was melt-kneaded in a biaxial kneader. The obtained kneaded product was then cracked in Rotoplex (manufactured by Hosokawa Micron Corp.) to give a cracked product. The obt...

example 2

[0042]A photosensitive toner was prepared in a similar manner to that of Example 1, except that 77.0 parts by mass of the polyester binder resin for toners was used, and that 10.0 parts by mass of the organic white pigment “Shigenox F” was used.

example 3

[0043]A photosensitive toner was prepared in a similar manner to that of Example 1, except that 72.0 parts by mass of the polyester binder resin for toners was used, and that 15.0 parts by mass of the organic white pigment “Shigenox F” was used.

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PUM

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Abstract

An erasable electrophotographic toner includes a binder resin, a near-infrared absorbing material, a decolorizing agent and an organic white pigment.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2011-247597, filed Nov. 11, 2011, the entire contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an erasable electrophotographic toner containing an organic white pigment and a method of producing the same.[0004]2. Description of the Related Art[0005]Jpn. Pat. Appln. KOKAI Publication Nos. 05-61247 and 2000-19770 suggest a process for erasing with heat or light a print which is obtained by forming an image on a copying machine or printer using an erasable toner with an erasable leuco dye or a near-infrared light responsive erasable photosensitive toner, and thereby recycling paper. An image forming apparatus for the process comprises an erasing unit for toners inside or outside of the apparatus. In the case when the content of printe...

Claims

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Application Information

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IPC IPC(8): G03G9/08
CPCG03G9/08G03G9/0802G03G9/0926G03G9/0924G03G9/081
Inventor NIINUMA, HIDEYOSHIIKEDA, HIDEKIKANAMURA, TOSHIAKI
Owner CASIO ELECTRONICS MFG CO LTD